#formula-editor{position:fixed;z-index:110;width:min(460px,calc(100vw - 16px));max-height:calc(100dvh - 16px);display:flex;flex-direction:column;box-sizing:border-box;color:#263b51;background:#fff;border:1px solid #dbe5ee;border-radius:16px;box-shadow:0 12px 44px #203b5b26;font:13px/1.45 system-ui,"Microsoft YaHei",sans-serif;overflow:hidden;text-align:left}
#formula-editor *{box-sizing:border-box}
#formula-editor [hidden]{display:none!important}
#formula-editor button{font:inherit;line-height:1.25;border:1px solid transparent;border-radius:7px;background:transparent;color:inherit;padding:6px 8px;cursor:pointer;white-space:nowrap;flex-shrink:0}
#formula-editor button:hover{background:#edf6ff}
#formula-editor button:focus-visible,#formula-editor input:focus-visible,#formula-editor textarea:focus-visible,#formula-editor .fe-drop:focus-visible{outline:2px solid #549bdf;outline-offset:1px}
#formula-editor button:disabled{opacity:.45;cursor:default}
#formula-editor button[aria-pressed=true]{background:#e4f1ff;color:#145eab}
#formula-editor .fe-head{display:flex;align-items:center;gap:8px;padding:10px;border-bottom:1px solid #e7edf3;flex-shrink:0;flex-wrap:wrap}
#formula-editor .fe-segment{display:flex;gap:2px;padding:2px;background:#f4f8fc;border-radius:9px}
#formula-editor .fe-segment:nth-child(2){margin-left:auto}
#formula-editor [data-action=fullscreen]{color:#146bc0;background:#edf6ff;margin-left:auto}
#formula-editor .fe-body{padding:12px;overflow:auto;min-height:0;overscroll-behavior:contain}
#formula-editor .fe-label{display:block;color:#6d8093;font-size:11px;margin-bottom:5px}
#formula-editor textarea{display:block;width:100%;min-height:54px;max-height:150px;resize:none;overflow:auto;padding:9px 11px;border:1px solid #dce7f0;border-radius:10px;background:#f7fbff;color:#233b51;font:13px/1.55 Consolas,monospace;tab-size:2}
#formula-editor .fe-preview{display:flex;justify-content:center;align-items:center;min-height:68px;max-height:160px;overflow:auto;padding:12px;margin:8px 0;border:1px solid #e4ecf3;border-radius:10px;background:white;font-size:17px}
#formula-editor .fe-preview .katex-display{margin:0;min-width:min-content}
#formula-editor .fe-error{display:block;text-align:left;white-space:normal;color:#b33443;background:#fff4f5;font-size:12px;width:100%;margin-bottom:8px}
#formula-editor .fe-groups{display:flex;flex-wrap:wrap;gap:2px;padding:2px 0 6px}
#formula-editor .fe-groups button{font-size:11px;padding:5px 7px}
#formula-editor .fe-symbols{display:grid;grid-template-columns:repeat(10,minmax(0,1fr));gap:4px;max-height:164px;overflow:auto;padding:5px;background:#f3f8fd;border-radius:10px;overscroll-behavior:contain}
#formula-editor .fe-symbols button{height:35px;background:white;border:1px solid #e3ebf3;padding:2px;display:grid;place-items:center;overflow:hidden;min-width:0;font-size:12px}
#formula-editor .fe-symbols button:hover{border-color:#87b7e7;background:#edf6ff}
#formula-editor .fe-symbols .fe-wide{grid-column:span 3;height:50px}
#formula-editor .fe-symbols .fe-note{grid-column:1/-1}
#formula-editor .fe-foot{display:flex;align-items:center;gap:8px;padding:10px 12px;border-top:1px solid #e7edf3;background:#fcfdff;flex-shrink:0}
#formula-editor .fe-foot>span{font-size:10px;color:#72859a;flex:1}
#formula-editor .fe-primary{background:#1672ce;color:white;padding:8px 14px}
#formula-editor .fe-primary:hover{background:#1261b1}
#formula-editor .fe-ask{display:flex;gap:5px;margin-top:10px}
#formula-editor .fe-ask input{min-width:0;flex:1;border:1px solid #e0e9f1;border-radius:8px;background:#f7fbff;padding:8px;font:12px system-ui;color:#263b51}
#formula-editor .fe-ai-status{font-size:11px;color:#687e94;white-space:pre-wrap;margin:7px 0 0}
#formula-editor .fe-ai-status:empty{display:none}
#formula-editor canvas{width:100%;height:160px;border:1px solid #dce7f0;border-radius:10px;touch-action:none;background:#fff;cursor:crosshair;display:block}
#formula-editor .fe-ink-tools{display:flex;gap:2px;align-items:center;margin-bottom:8px;flex-wrap:wrap}
#formula-editor .fe-ink-tools button:last-child{margin-left:auto;color:#146bc0;background:#edf6ff}
#formula-editor .fe-note,#formula-editor .fe-auto{font-size:11px;color:#71859a;margin:7px 0}
#formula-editor .fe-auto{display:flex;align-items:center;gap:5px}
#formula-editor .fe-ink-meta{display:flex;align-items:center;flex-wrap:wrap;gap:4px 14px;margin-top:7px;flex-shrink:0}
#formula-editor .fe-ink-meta .fe-auto,#formula-editor .fe-ink-meta .fe-note,#formula-editor .fe-ink-meta .fe-ai-status{margin:0}
#formula-editor .fe-ink-meta .fe-auto{white-space:nowrap}
#formula-editor .fe-drop{display:block;padding:28px 16px;border:1px dashed #93b9dd;border-radius:10px;background:#f5faff;text-align:center;cursor:pointer;color:#507799}
#formula-editor .fe-image{max-width:100%;max-height:140px;object-fit:contain;margin:8px auto;display:block}
#formula-editor .fe-candidates{display:grid;gap:6px;margin-top:8px}
#formula-editor .fe-candidate{display:grid;gap:5px;text-align:left;white-space:normal;border:1px solid #dce8f3;padding:10px;overflow:auto}
#formula-editor .fe-candidate code{font:11px/1.4 Consolas,monospace;white-space:pre-wrap;color:#6c8297}
#formula-editor.fe-fullscreen{inset:0!important;width:100%;height:100dvh;max-height:none;border:0;border-radius:0;z-index:2147483000;padding:env(safe-area-inset-top) env(safe-area-inset-right) env(safe-area-inset-bottom) env(safe-area-inset-left)}
#formula-editor.fe-fullscreen .fe-head{padding:12px 20px}
#formula-editor.fe-fullscreen .fe-body{flex:1;padding:16px 24px}
#formula-editor.fe-fullscreen[data-view=ink] .fe-body{display:flex;flex-direction:column}
#formula-editor.fe-fullscreen [data-pane=ink]{display:flex;flex-direction:column;flex:1;min-height:160px}
#formula-editor.fe-fullscreen canvas{flex:1;height:0;min-height:96px}
#formula-editor.fe-fullscreen .fe-ink-tools,#formula-editor.fe-fullscreen .fe-auto,#formula-editor.fe-fullscreen .fe-note,#formula-editor.fe-fullscreen .fe-ai-status{flex-shrink:0}
#formula-editor.fe-fullscreen .fe-ink-tools button{padding:9px 14px}
#formula-editor.fe-fullscreen .fe-candidates{flex-shrink:0;max-height:min(28dvh,240px);overflow:auto}
#formula-editor.fe-fullscreen [data-pane=type],#formula-editor.fe-fullscreen [data-pane=image]{max-width:900px;margin:auto}
#formula-editor.fe-fullscreen .fe-image{max-height:45dvh}
#formula-editor.fe-fullscreen .fe-foot{padding:12px 24px}
@media(max-width:600px){#formula-editor.fe-fullscreen .fe-head{padding:8px}#formula-editor.fe-fullscreen .fe-body{padding:8px}#formula-editor.fe-fullscreen .fe-foot{padding:8px 12px}#formula-editor.fe-fullscreen .fe-ink-tools button{padding:8px}}
@media(max-width:480px){#formula-editor .fe-head{gap:3px;padding:7px}#formula-editor .fe-head button{padding:6px}#formula-editor .fe-body{padding:8px}#formula-editor .fe-symbols{grid-template-columns:repeat(8,minmax(0,1fr))}#formula-editor .fe-foot>span{font-size:9px}}
@media print{#formula-editor{display:none!important}}

/* Inline and display LaTeX typed in a text box; the source stays in data-tex. */
.ppt-latex { display: inline-block; }
.ppt-latex-error { color: #b3261e; }